How can you calculate the earth vector during its motion around the sun?

What is the vector (speed and direction) of the earth motion around the sun?


Could you kindly state the equation of the earth motion around the sun? Also, from the equation, what is the earth vector on December 21, and on January 5, every year?


I would greatly appreciate your assistance in this matter. References to any site that shows the eccentricity of earth motion around the sun is also very much appreciated. Thank you!|||In astronomy, Kepler's laws give a description of the motion of planets around the Sun.


http://en.wikipedia.org/wiki/Kepler%27s_鈥?/a>





Kepler used these three laws for computing the position of a planet as a function of time. His method involves the solution of a transcendental equation called Kepler's equation.


http://en.wikipedia.org/wiki/Kepler%27s_鈥?/a>





Earth orbits the Sun at an average distance of about 150 million kilometers every 365.2564 mean solar days, or one sidereal year.


http://en.wikipedia.org/wiki/Earth#Orbit|||%26lt;QUOTE%26gt;How can you calculate the earth vector during its motion around the sun?%26lt;/QUOTE%26gt;





Simple. Write the Sun vector and invert the signal.